Heating Operation; Dry Operation - Fujitsu AS*G09LTCB Service Instructions Manual

2. HEATING OPERATION

A sensor (room temperature thermistor) built in the indoor unit body will usually perceive
difference or variation between a set temperature and present room temperature, and
controls the operation frequency of the compressor.
* If the room temperature is lower by 3°C than a set temperature, the compressor operation
frequency will attain to maximum performance.
* If the room temperature is some degrees higher than a set temperature,
the compressor will be stopped.
* When the room temperature is between +2.5°C to -3°C of the setting temperature,
the compressor frequency is controlled within the range shown in Table 3.
However, the maximum frequency is limited shown in Table 4 based on the fan mode.
( Table 3 : Compressor frequency range )
AS*G09LTCB
AS*G12LTCB
AS*G14LTCB

3. DRY OPERATION

The compressor frequency shall change according to the temperature, set temperature,
and room temperature variation which the room temperature sensor of the indoor unit body has
detected as shown in the Table 4.
However, after the compressor is driven, the indoor unit shall run at operation frequency of
61rps (09LTCB), 51rps (12LTCB), 52rps (14LTCB) for 60 seconds.
( Table 4 : Compressor frequency in Dry mode)
09LTCB X zone
J zone
Y zone
( Fig.2 : Compressor control based on room temperature )
Room
temperature drops
X zone
Ts+0.5°C
J zone
Ts -1.5°C
Y zone
Minimum Maximum
frequency frequency
18rps 130rps
16rps 119rps
16rps 140rps
Operating
frequency
33rps
12LTCB X zone
25rps J zone
0rps Y zone
Room
temperature rises
Ts+1.5°C
Ts -0.5°C
Operating
frequency
26rps 14LTCB
18rps
0rps
01-02
Operating
frequency
X zone 24rps
J zone
16rps
Y zone
0rps